why do we need this in a separate file? also, these are the ones used by `make package`:

https://github.com/mozilla/yogafire/blob/master/hearth/media/js/settings_package_dev.js
https://github.com/mozilla/yogafire/blob/master/hearth/media/js/settings_package_stage.js
https://github.com/mozilla/yogafire/blob/master/hearth/media/js/settings_package_prod.js